Image Reading Roller Nipping for Sheet Vibration Control
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Solution Overview
Problem
Existing image reading apparatuses face challenges in maintaining good reading accuracy due to changes in sheet feeding speed and vibrations caused by external forces when the leading end of the sheet contacts guiding members during the reading process.
Innovation Solution
The image reading apparatus includes an image reading sensor, a transparent plate, a guiding member, a first roller pair, and a second roller pair, where the rollers are positioned to nip the sheet when it enters between the guiding member and the transparent plate, stabilizing the sheet's position and reducing friction, thus minimizing speed changes and vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the leading end of the sheet contacts the sheet guiding member during reading, then the sheet is guided through the reading position, but external force is exerted on the sheet causing feeding speed changes and vibrations that reduce reading accuracy
Solution Approach 1:
The sheet is nipped by the roller pair before it contacts the sheet guiding member during reading. This preliminary nipping action secures the sheet in advance, preventing the harmful external force from causing feeding speed changes and vibrations when the sheet leading end contacts the guiding member.
Solution Approach 2:
The roller pair provides a cushioning effect by nipping the sheet before it reaches the sheet guiding member. This beforehand cushioning prevents the sheet from being suddenly subjected to external force, thereby maintaining stable feeding speed and reducing vibrations during the reading process.
2Stability of the object's composition
If the sheet is nipped by roller pairs before entering the reading position, then feeding speed stability is improved, but device complexity increases due to additional roller pairs
Solution Approach 1:
The roller pair is designed to serve multiple functions: it both feeds the sheet through the reading position and nips the sheet before the leading end contacts the sheet guiding member. By combining these functions into a single component, the patent achieves feeding speed stability without proportionally increasing device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances reading accuracy by maintaining consistent sheet feeding speed and reducing vibrations, leading to improved image reading precision.
Implementation Method 1
a transparent plate provided opposed to the image reading sensor and having a light-transmission property
Data Source
AI summary
An image reading apparatus includes an image reading sensor, a transparent plate, a guiding member, a first roller pair, and a second roller pair provided upstream of the first roller pair with respect to a sheet feeding direction. The first roller pair and the second roller pair are disposed so as to nip a sheet in each of nips of the first roller pair and the second roller pair when a leading end of the sheet enters between the guiding member and the transparent plate.